DS who's almost 12 and a few other classmates - boys and girls - were shown some gay porn images by a kid in their year - think S&M with blurred out genitals, men in skimpy undies gyrating into each other, naked men spread-eagled with pixilated bits etc. It happened during break and on the school bus. The child saw them at home on dad's lap top.
My course of action has been criticised by Ex DH.
WWYD? Nothing, speak to the parents, speak to the school or social services?